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Broadband Surface Plasmon Lasing in One-dimensional Metallic Gratings on Semiconductor
Seung-Hyun Kim1,2, Won Seok Han3, Tae-Young Jeong1
1Department of Physics, Chungnam National University, Daejeon, 34134, South Korea.
Scientific Reports
|August 13, 2017
Summary
We demonstrate surface plasmon (SP) lasing in novel metal/semiconductor nanostructures. This breakthrough enables tunable, room-temperature SP light emission for advanced photonic applications.
Area of Science:
- Photonics and Nanotechnology
- Optoelectronics
- Materials Science
Background:
- Surface plasmon (SP) phenomena offer unique light-matter interactions at the nanoscale.
- Metal-semiconductor nanostructures are promising for developing novel light sources.
- Achieving efficient and tunable SP lasing remains a key challenge.
Purpose of the Study:
- To report and characterize surface plasmon (SP) lasing in a metal/semiconductor nanostructure.
- To demonstrate the device's performance as a tunable SP light source.
- To investigate the underlying mechanisms, including the Purcell effect, enabling SP lasing.
Main Methods:
- Fabrication of one-dimensional periodic silver slit gratings on an InGaAsP semiconductor layer.
- Characterization of lasing properties including emission wavelength, polarization, and spatial coherence.
- Analysis of linear transmission and comparison with lasing behavior.
Main Results:
- Successful demonstration of SP lasing in the metal/semiconductor nanostructure.
- Tunable emission achieved across a 400-nm-wide telecom wavelength band at room temperature.
- Confirmation of SP nature through wavelength dependence on grating period and polarization analysis.
- Evidence of stimulated emission enhancement by the Purcell effect enabling lasing above the semiconductor bandgap energy.
Conclusions:
- The developed metal/semiconductor nanostructure serves as an efficient surface plasmon (SP) light source.
- The Purcell effect plays a crucial role in achieving SP lasing.
- Further optimization of grating dimensions and metal choice can enhance lasing efficiency.
